Service manual

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EPSON LQ-300+ Revision C
Operating Principles Printer Mechanism 33
2.2.1 Printhead
The table below shows the printhead specifications.
Figure 2-3. Wire Configuration
2.2.1.1 Buzzer Function
This printhead also works as a buzzer. The table below is buzzer specification.
Table 2-1. Printhead Specifications
Item Specification
Number of wires 24
Diameter of wire φ0.20 mm
Wire configuration
See the figure below.
Note: The figure is seen from the back of the head
facing printing side.
Direct current coil resistance 54.7 ± 3.9Ω (at 25°C)
Number of coils 24
Head drive method Rated voltage drive
Head drive voltage 35V ± 3.5V
Maximum peak current
• Normal Mode: 0.65A (38.5V x 270µs at 5°C)
• Copy Mode: 0.67A (38.5V x 290µs at 5°C)
Head drive frequency
• Normal: 1350Hz or less
• Copy: 1350Hz or less
Head life
• Black ribbon: 0.2 billion stroke/ wire or more
• Color and film ribbon: 0.1 billion stroke/ wire or
more
Environmental condition
• Temperature: 5 to 55°C
• Humidity: 10 to 85% (
Table 2-2. Buzzer Function -- Specification
Item Specification
Head voltage 35V ± 3.5V
Drive frequency 2kHz, 1.5kHz
#1
#3
#5
#7
#9
#11
#13
#15
#17
#19
#21
#23
#2
#4
#6
#8
#10
#12
#14
#16
#18
#20
#22
#24
Head Center
1.08